when starting the installer-file to upgrade EMC from 22.214.171.124 to 126.96.36.199, the installer tries to update the OS.
After executing the file, it aborts because "internet connection cannot be established".
I sniffered the data traffic from the appliance and found out, that he does a name resolution on "security.ubuntu.com" with 188.8.131.52.
After that a http-Request with get /ubuntu is generated, but that one failes with 503 - service unavailable.
I accessed this page manually in the web browser and the website is working.
I also tried other IPs from the pool security.ubuntu.com, but that hasn't worked either.
Does anyone experienced the same problem?